No. Lightroom is a standalone
application, not a plug-in to or extension of Photoshop.

Q: What’s the difference between Lightroom and Photoshop?

A: Adobe Photoshop is the industry standard in digital imaging, with
tools for image editing and compositing. Lightroom addresses the workflow
concerns of professional photographers, allowing you to efficiently import,
manage, adjust, and present large volumes of images.

Q: Is Lightroom a workflow productivity tool or an image-editing tool?

A: Lightroom gives photographers the tools they need to do everything
from quickly downloading hundreds of images from their cameras to making a
sophisticated presentation of images to clients. Lightroom also lets you easily
make global adjustments to images—for example, you can lighten all of the images
from a shoot that occurred on an overcast day. For detailed editing or
compositing, you can switch to Photoshop.

Q: What’s the difference between Lightroom and Adobe Bridge?

A: Adobe Bridge is the navigational control center for Adobe Creative
Suite® software, allowing you to manage the assets that are used with the
components of Creative Suite and offering workgroup management tools. If you use
Creative Suite, you can continue to use Bridge for those capabilities. But if
you don’t use Creative Suite or prefer an application that is 100% tuned to
photographers, Lightroom is for you.

Q: Can I work with camera raw images in Lightroom?

A: Yes. Lightroom supports more than 140 camera raw file formats from
more than a dozen digital camera manufacturers.* Lightroom also offers the same
camera raw functionality that’s in Photoshop and Adobe Bridge, which means you
can perform the same nondestructive edits to images in Lightroom that you can
perform in the Camera Raw dialog box in Photoshop. Lightroom also extends
nondestructive editing to all of the other image formats that it supports,
including JPEG, TIFF, and PNG.